: Do not rename the files. They must have identical names except for the part numbers.
: If part 12 is the last one you have but the program asks for "part 13," you are missing a file. Final.Fantasy.XIII.part12.rar
If you are actually looking for a guide to of the game (Eden), here are key strategies from expert walkthroughs on IGN and GameFAQs : : Do not rename the files
The file "Final.Fantasy.XIII.part12.rar" is part of a , meaning it is just one piece of a larger set required to extract the full game or content. How to Extract Multi-Part RAR Files If you are actually looking for a guide
: If you get a "CRC failed" error, one of your parts (possibly part 12) was damaged during download. You can try the "Repair" function in WinRAR or re-download that specific part. Final Fantasy XIII: Chapter 12 Gameplay Guide